CN102443687A - Microstructure component controlling method for raising yield ratio of fine grain reinforced bar - Google Patents
Microstructure component controlling method for raising yield ratio of fine grain reinforced bar Download PDFInfo
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- CN102443687A CN102443687A CN201110364035XA CN201110364035A CN102443687A CN 102443687 A CN102443687 A CN 102443687A CN 201110364035X A CN201110364035X A CN 201110364035XA CN 201110364035 A CN201110364035 A CN 201110364035A CN 102443687 A CN102443687 A CN 102443687A
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Abstract
The invention provides a microstructure component controlling method for raising yield ratio of a fine grain reinforced bar, which belongs to the metal thermal treatment technical field. According to index requirements of different intensity grades of the reinforced bar, microalloy elements are not added or added by quantitative reduction. The reinforced bar comprises the following chemical components: 0.12-0.25wt% of C, 0.20-0.60wt% of Si, 1.20-2.00wt% of Mn, less than or equal to 0.045wt% of S, less than or equal to 0.045wt% of P, and the balance of Fe and inevitable impurities. According to the invention, the content of normal elements C, Si and Mn in the steel can be adjusted, a fine grain steel production technology is combined, the microstructure component controlling technology of fine grain reinforced bar can be improved, so that the pearlite volume percentage in microstructure of the reinforced bar is controlled at the level greater than or equal to 20%, the yield ratio of the fine grain reinforced bar is greater than or equal to 1.25, other performance indices completely satisfy performance index in GB1499-2007, and the quality is stable.
Description
Technical field
The invention belongs to the metal hot processing field, a kind of structural constituent control method that improves fine grained steel muscle strong flexor ratio particularly is provided.For the strong flexor ratio performance requriements that guarantees the fine grain, high strength reinforcing bar provides control method, promoted effective enforcement of close grain reinforcing bar production technique.
Background technology
All the time, grain refining is considered to improve simultaneously steel strength and the most effective means of flexible.It is the problem that must solve during close grain and ultra-fine grain steel are applied that yet grain refining brings strong flexor ratio to reduce (as shown in Figure 1).The height of strong flexor ratio has determined material from producing viscous deformation to the deformation capacity the fracture.The strong flexor ratio of the reinforcing bar that uses in the anti-seismic structure is bigger; After certain cross section of member forms plasticity; Can make plastic hinge that enough turning powers are arranged, avoid reinforcing bar to break too early, thereby the assurance entire structure obtains fully to absorb the ability of seismic energy and be unlikely to collapse.Grain-size as shown in Figure 1 is to the influence (annotating: select from Yong Qilong work " second phase in the ferrous materials ") of steel strong flexor ratio
China is the maximum country of world's THE STRONG CONTINENTAL EARTHQUAKES.In China's domain 23 seismic zones are arranged; Provinces and cities, municipality directly under the Central Government all distribute wherein mostly; Surpassing 80% buildings all has the antidetonation demand, and therefore, the lower limit with the strong flexor ratio of reinforcing bar among the Chinese GB1499-2008 is decided to be 1.25; Be higher than foreign standard index (English mark BS4449-2007 lower limit 1.08, Australia's new standard lower limit 1.15).In order to satisfy seismic design, acceptance specification requirement, be used for the longitudinal stress reinforcing bar of I and II anti-seismic structure, its strong flexor ratio also is essential items for inspection.
Domestic production 400MPa, 500MPa high-strength quake-proof reinforcing steel bar mainly adopt the method for microalloy to guarantee the intensity of reinforcing bar and the performance requriements of strong flexor ratio at present.Along with the paces that domestic High Strength Steel Bar is applied are accelerated; A large amount of High Strength Steel Bars press for the composition design of adopting the microalloy minimizing; Active adoption close grain, ultra-fine grain steel production technology, promotion has the fine grain, high strength reinforcing bar widespread use under construction of high strong flexor ratio, cost economical rationality.
One of method that improves strong flexor ratio is the ratio row of hard phase in the control microstructure.For the reinforcing bar of ferritic-pearlitic structure of steel, the refinement ferrite crystal grain is controlled the volume(tric)fraction of organizing Medium pearlite simultaneously can realize the target that improves reinforced steel bar strength, improve strong flexor ratio.
Summary of the invention
The object of the present invention is to provide a kind of structural constituent control method that the strong muscle of fine grained steel is bent ratio that improves, solved grain refining and caused reinforcement yielding intensity and tensile strength to improve, reduce the problem of strong flexor ratio synchronously.
The present invention starts with from the relation of setting up perlite volume(tric)fraction and yield tensile ratio, and through the content of conventional Elements C, Si, Mn in the adjustment steel, combined with fine-grained grain steel production technique is improved the structural constituent control techniques of close grain reinforcing bar.The close grain reinforcing bar of producing in this way has good mechanical property and the strong flexor ratio that meets the GB1499-2007 performance index.Moreover, the close grain reinforcing bar that adopts this method to produce has good aging performance, the risk that the reinforcement property index reduces when having exempted manufacturing enterprise's dilivery state.
The basic alloys composition of reinforcing bar of the present invention is measured (wt%) by weight percentage:
C:0.12～0.25, Si:0.20～0.6, Mn:1.20～2.0; S≤0.045; The index request of different intensity grades is satisfied in order to guarantee reinforcing bar in P≤0.045, can be according to the production unit condition; Do not add or add in right amount the consumption of microalloy element, surplus is Fe and unavoidable impurities element.
Working method of the present invention is: through C, Si, Mn content in the adjustment steel, combined with fine-grained grain steel production technique realizes structural transformation and the accurate control of organizing the Medium pearlite volume(tric)fraction, the strong flexor ratio index of assurance close grain reinforcing bar.On hot rolling technology, adopt fine grained steel production control technology: 900～950 ℃ of start rolling temperatures; The controlled rolling temperature is at 700 ℃～880 ℃; The cooling control after rolling temperature is 600 ℃～700 ℃ TR; Resulting ferritic, the pearlitic structure of being organized as, wherein ferritic average grain size are 6～10 μ m, control perlite percent by volume >=20%.The mechanical property of the reinforcing bar of producing reaches each item index of 400MPa level among the GB1499-2007,500MPa grade reinforcing steel, and strong flexor ratio all >=1.25.Perlite percent by volume in tissue be lower than 20% then do not reach strong flexor ratio the lower limit index, see table 1.
The present invention is the basis with common carbon manganese steel, and process for making is mature and stable.According to producing other requirement of different intensity scale, each composition percentage composition control is as follows in the steel:
C：0.12～0.25，Si：0.20～0.6，Mn：1.20～2.0，S≤0.045，P≤0.045。
According to actual needs, on mentioned component system basis, can also add alloying elements such as V, Nb, Ti by trace, to obtain the toughness that higher intensity is become reconciled.
The invention has the advantages that combined with fine-grained grain steel production technique is produced the qualified reinforcing bar of high strong flexor ratio through the adjusting of conventional ingredients such as C, Si, Mn.Utilize the High Strength Steel Bar cost economy of the different stage that the present invention produces, rationally, microalloy element can not be added in the production of 400MPa grade reinforcing steel, and 500MPa grade reinforcing steel trace adds alloying element, has significantly saved alloy resource.
Description of drawings
Fig. 1 is the influence (annotate: select from Yong Qilong work " second phase in ferrous materials ") of grain-size to the steel strong flexor ratio.
Fig. 2 is the φ 18mm Twisted Steel (sample number into spectrum 9 of intensity rank 400MPa level in the embodiment of the invention 1
#Steel) metallographic structure photo.
Fig. 3 is the φ 20mm Twisted Steel (sample number into spectrum 3 of intensity rank 400MPa level in the embodiment of the invention 2
#Steel) metallographic structure photo.
Fig. 4 is the φ 16mm Twisted Steel (sample number into spectrum 2 of intensity rank 500MPa level in the embodiment of the invention 2
#Steel) metallographic structure photo.
Embodiment
Embodiment 1
On the composition basis of Q235, improve Si, Mn content, as shown in table 2.Through steel-making, continuous casting, hot continuous rolling; Rolling technology adopts fine grained steel production technique (950 ℃ of start rolling temperatures, 800 ℃ of controlled rolling temperature, cooling control after rolling temperature are not less than 600 ℃); Be rolled into φ 18mm, Twisted Steel, and respectively to reinforcing bar wherein its mechanical property of φ 18mm see table 3.
The chemical ingredients of table 2, φ 18mm hot-rolled reinforced bar
| C | Si | Mn | P | S |
| 0.15 | 0.50 | 1.43 | 0.028 | 0.014 |
The room temperature tensile performance of table 3, φ 18mm hot-rolled reinforced bar
Getting a plurality of visual fields and carry out metallographicobservation, is 29.6% through the percent by volume of its Medium pearlite of facies analysis computed in software in tissue.Surpassed 20% threshold value.
Fig. 2 is the metallographic structure photo of 400MPa level φ 18mm hot-rolled reinforced bar in the embodiment of the invention 1.
Embodiment 2
On the composition basis of Q235, improve C content, as shown in table 3.Through steel-making, continuous casting, hot continuous rolling; Rolling technology adopts fine grained steel production technique (920 ℃ of start rolling temperatures, controlled rolling temperature are lower than 780 ℃, and the cooling control after rolling temperature is not less than 650 ℃); Be rolled into the Twisted Steel of φ 20mm, and respectively to reinforcing bar wherein its mechanical property of φ 20mm see table 4.
The chemical ingredients of table 3, φ 20mm hot-rolled reinforced bar
| The trade mark | C | Si | Mn | P | S |
| HRB400 | 0.25 | 0.32 | 0.68 | 0.026 | 0.021 |
The room temperature tensile performance of table 4, φ 20mm hot-rolled reinforced bar
| Sample number into spectrum | Ys | Tensile strength | Strong flexor ratio | Unit elongation |
| 3 | 425 | 563 | 1.32 | 20.5 |
Getting a plurality of visual fields and carry out metallographicobservation, is 26.3% through the percent by volume of its Medium pearlite of facies analysis computed in software in tissue, has surpassed 20% threshold value.
Fig. 3 is the metallographic structure photo of 400MPa level φ 20mm hot-rolled reinforced bar in the embodiment of the invention 2.
Embodiment 3
The described composition of table 5 is through steel-making, continuous casting, hot continuous rolling; Rolling technology adopts fine grained steel production technique (950 ℃ of start rolling temperatures; The controlled rolling temperature is lower than 830 ℃; The cooling control after rolling temperature is not less than 600 ℃), be rolled into φ 16mm, Twisted Steel, and respectively to reinforcing bar wherein its mechanical property of φ 16mm see table 6.
The chemical ingredients of table 5, φ 16mm hot-rolled reinforced bar
| The trade mark | C | Si | Mn | P | S | V | N |
| HRB500 | 0.23 | 0.64 | 1.51 | 0.022 | 0.020 | 0.075 | 0.014 |
The room temperature tensile performance of table 6, φ 16mm hot-rolled reinforced bar
| Sample number into spectrum | Ys | Tensile strength | Strong flexor ratio | Unit elongation |
| 2 | 530 | 680 | 1.28 | 25.5 |
Getting a plurality of visual fields and carry out metallographicobservation, is 31.7% through the percent by volume of its Medium pearlite of facies analysis computed in software in tissue, has surpassed 20% threshold value.
Fig. 4 is the metallographic structure photo of 500MPa level φ 16mm hot-rolled reinforced bar in the embodiment of the invention 3.
Reinforcing bar among embodiment 1, embodiment 2 and the embodiment 3 carries out seasoning, and timeliness stretched after 3 months, and its performance all satisfies the standard-required of GB1499-2007.2.
Claims (2)
1. structural constituent control method that improves fine grained steel muscle strong flexor ratio is characterized in that the technical parameter of technology and control thereof is:
C, Si, Mn content are in the adjusting steel: C:0.12～0.25, Si:0.20～0.6, Mn:1.20～2.0; S≤0.045; The index request of different intensity grades is satisfied in order to guarantee reinforcing bar in P≤0.045, can be according to the production unit condition; Do not add or add in right amount the consumption of microalloy element, surplus is Fe and unavoidable impurities element; Be weight percentage;
On hot rolling technology, adopt fine grained steel production control technology: 900～950 ℃ of start rolling temperatures; The controlled rolling temperature is at 700 ℃～880 ℃; The cooling control after rolling temperature is 600 ℃～700 ℃ TR; Resulting ferritic, the pearlitic structure of being organized as, wherein ferritic average grain size are 6～10 μ m, control perlite percent by volume >=20%; The mechanical property of the reinforcing bar of producing reaches each item index of 400MPa level among the GB1499-2007,500MPa grade reinforcing steel, and strong flexor ratio all >=1.25.
2. method according to claim 1 is characterized in that, trace adds V, Nb, Ti alloying element on mentioned component system basis, to obtain the toughness that higher intensity is become reconciled.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102864376A (en) * | 2012-09-13 | 2013-01-09 | 莱芜钢铁集团有限公司 | High-strength full-thread equal-strong resin bolting reinforcing bar and production method thereof |
| CN102989763A (en) * | 2012-11-26 | 2013-03-27 | 首钢总公司 | Production method of four-segment high-strength aseismic reinforcement |
| CN103627869A (en) * | 2013-12-06 | 2014-03-12 | 攀钢集团西昌钢钒有限公司 | After-rolling controlled cooling process and preparation method of pipeline steel with low yield ratio |
| CN104480388A (en) * | 2014-12-13 | 2015-04-01 | 广西科技大学 | Novel formula of semi-grouting type high-strength thick reinforcing bar |
| CN104532162A (en) * | 2014-12-13 | 2015-04-22 | 广西科技大学 | Formula of high-strength steel bar |
| CN106399848A (en) * | 2016-09-19 | 2017-02-15 | 石横特钢集团有限公司 | High-toughness MG500 anchor rod reinforcing steel bar and production method thereof |
| CN110106446A (en) * | 2019-06-24 | 2019-08-09 | 新余钢铁股份有限公司 | A kind of 400MPa grades of hot rolled ribbed bars containing Ti and its production technology |
| CN110205550A (en) * | 2019-06-24 | 2019-09-06 | 新余钢铁股份有限公司 | 400MPa grades contain Cr, Ti hot rolled ribbed bars and its production technology |
| CN110295326A (en) * | 2019-08-07 | 2019-10-01 | 无锡东大汉森冶金实业有限公司 | The titanium micro-alloyed high-strength anti-seismic steel bar of HRB500E niobium and production technology |
| CN110819892A (en) * | 2019-10-14 | 2020-02-21 | 长沙东鑫环保材料有限责任公司 | Niobium-nitrogen-containing microalloyed HRB400E steel bar and production method thereof |
| CN111549289A (en) * | 2020-06-19 | 2020-08-18 | 阳春新钢铁有限责任公司 | Ultra-high pulling speed niobium-containing HRB400E deformed steel bar and production process thereof |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102864376B (en) * | 2012-09-13 | 2014-04-23 | 莱芜钢铁集团有限公司 | High-strength full-thread equal-strong resin bolting reinforcing bar and production method thereof |
| CN102864376A (en) * | 2012-09-13 | 2013-01-09 | 莱芜钢铁集团有限公司 | High-strength full-thread equal-strong resin bolting reinforcing bar and production method thereof |
| CN102989763A (en) * | 2012-11-26 | 2013-03-27 | 首钢总公司 | Production method of four-segment high-strength aseismic reinforcement |
| CN103627869B (en) * | 2013-12-06 | 2016-03-02 | 攀钢集团西昌钢钒有限公司 | A kind of cooling control after rolling technique of low-yield ratio pipeline steel and preparation method |
| CN103627869A (en) * | 2013-12-06 | 2014-03-12 | 攀钢集团西昌钢钒有限公司 | After-rolling controlled cooling process and preparation method of pipeline steel with low yield ratio |
| CN104480388A (en) * | 2014-12-13 | 2015-04-01 | 广西科技大学 | Novel formula of semi-grouting type high-strength thick reinforcing bar |
| CN104532162A (en) * | 2014-12-13 | 2015-04-22 | 广西科技大学 | Formula of high-strength steel bar |
| CN106399848A (en) * | 2016-09-19 | 2017-02-15 | 石横特钢集团有限公司 | High-toughness MG500 anchor rod reinforcing steel bar and production method thereof |
| CN110106446A (en) * | 2019-06-24 | 2019-08-09 | 新余钢铁股份有限公司 | A kind of 400MPa grades of hot rolled ribbed bars containing Ti and its production technology |
| CN110205550A (en) * | 2019-06-24 | 2019-09-06 | 新余钢铁股份有限公司 | 400MPa grades contain Cr, Ti hot rolled ribbed bars and its production technology |
| CN110106446B (en) * | 2019-06-24 | 2021-04-13 | 新余钢铁股份有限公司 | 400 MPa-grade Ti-containing hot-rolled ribbed steel bar and production process thereof |
| CN110295326A (en) * | 2019-08-07 | 2019-10-01 | 无锡东大汉森冶金实业有限公司 | The titanium micro-alloyed high-strength anti-seismic steel bar of HRB500E niobium and production technology |
| CN110819892A (en) * | 2019-10-14 | 2020-02-21 | 长沙东鑫环保材料有限责任公司 | Niobium-nitrogen-containing microalloyed HRB400E steel bar and production method thereof |
| CN111549289A (en) * | 2020-06-19 | 2020-08-18 | 阳春新钢铁有限责任公司 | Ultra-high pulling speed niobium-containing HRB400E deformed steel bar and production process thereof |
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Application publication date: 20120509 |